html{height:100%;
}
body{margin:0;
    height:100%;
    color:#333;
    font-family:Tahoma,simsun;font-size:15px;}
.top{
    position: absolute;
    background:#369;
    height:52px;
    width:100%;
    left:0%;
    top:0px;}
.top-title{
    color:#fff;
    font-family:'Microsoft YaHei';
    font-size:16px;
    font-weight:bold;
    text-align: center;
    line-height:52px;}
.main{min-height:100%;
    background:#fff;
    width:80%;
    margin:0 auto;}
.main-title{margin-top:20px;
    margin-left:20px;
    margin-bottom:20px;
    font-family:'Microsoft YaHei';
    font-size:23px;
    color:#3aa4e5;}

.btn{
background-color: #369; 
border: none;
color: white;
padding: 15px 32px;
text-align: center;
text-decoration: none;
display: inline-block;
font-size: 16px;
vertical-align: middle;}
.heigh{
    margin-top:120px;margin-left:40px;
}